121308724 has 6 divisors (see below), whose sum is σ = 212290274. Its totient is φ = 60654360.

The previous prime is 121308721. The next prime is 121308731. The reversal of 121308724 is 427803121.

It can be written as a sum of positive squares in only one way, i.e., 87086224 + 34222500 = 9332^2 + 5850^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121308692 and 121308701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121308721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15163587 + ... + 15163594.

Almost surely, 2^121308724 is an apocalyptic number.

It is an amenable number.

121308724 is a deficient number, since it is larger than the sum of its proper divisors (90981550).

121308724 is a wasteful number, since it uses less digits than its factorization.

121308724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30327185 (or 30327183 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 121308724 is about 11014.0239694673. The cubic root of 121308724 is about 495.0290415910.

It can be divided in two parts, 12 and 1308724, that added together give a square (1308736 = 1144²).

The spelling of 121308724 in words is "one hundred twenty-one million, three hundred eight thousand, seven hundred twenty-four".